The ultimate classic is the plastic lens thingy for ELITE that you put to the TV screen to decode the whateveritwas pattern.
Now, depending on your vision (20/20 or less perfect!) and Rorschach power (tm), you could actually play the game you paid for
I have a distinct recollection they recalled boxes with that thing in them, can anyone confirm?
Edit: Silver, LensLok(tm), that's it